On Ukraine, Ryder said U.S. policy on the use of long-range American weapons has not changed. "We've worked with the Ukrainians to ensure that they have the ability to conduct cross-border counterfire - defensive strikes - to defend their troops that are being attacked from across the border in Russia," Ryder said. "We are very, very much focused … on ensuring that Ukraine has what it needs to be able to preserve its sovereignty and take back occupied territory. That's going to continue to be our focus." 美国防部网站昨天的报导.